Method of detecting objects within range of a receiver
First Claim
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1. A method of detecting a variable number of objects within range of a receiver, comprising:
- (a) transmitting from each object a supervisory message from time to time;
(b) detecting the supervisory message by the receiver over a detection interval;
(c) dynamically varying the detection interval based on a number of objects under supervision and the probability of collisions of the supervisory messages;
(d) increasing the detection interval to the extent that no collisions of any previously undetected supervisory message occurs; and
(e) raising an alarm in the event a supervisory message of a previously detected object is not detected within the detection interval.
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Abstract
A method of detecting a variable number of objects within range of a receiver, is comprised of transmitting from each object a supervisory message from time to time, detecting the supervisory message by the receiver over a detection interval, and varying the detection interval based on a number of objects under supervision and the probability of collisions of the supervisory messages.
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Citations
20 Claims
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1. A method of detecting a variable number of objects within range of a receiver, comprising:
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(a) transmitting from each object a supervisory message from time to time;
(b) detecting the supervisory message by the receiver over a detection interval;
(c) dynamically varying the detection interval based on a number of objects under supervision and the probability of collisions of the supervisory messages;
(d) increasing the detection interval to the extent that no collisions of any previously undetected supervisory message occurs; and
(e) raising an alarm in the event a supervisory message of a previously detected object is not detected within the detection interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
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12. A method of detecting a variable number of objects within range of a receiver, comprising:
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(a) transmitting from each object a supervisory message from time to time;
,(b) detecting the supervisory message by the receiver over a detection interval;
(c) dynamically varying the detection interval based on a number of objects under supervision and the probability of collisions of the supervisory messages;
(d) Increasing the detection interval to the extent that no collisions of any previously undetected supervisory message occurs;
(e) providing plural ones of said receivers each having an object detection region which overlaps the detection region of a neighboring receiver, and repeating steps (a), (b), (c), and (d) for each receiver;
(f) controlling the receivers from a control computer, and determining various detection intervals of the respective receivers by the control computer; and
(g) raising an alarm in the event the supervisory message from an object detected by more than one receiver is not detected within a detection interval which is the shortest used by said more than one receiver. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification